Condenser cemented sectional insulator



. mirri-:D` STA-.TES

PATENT OFFICE.

SOL. S. SONNEBORN, OF BROOKLYN, NEW YORK, ASSIGNOR TO HOIPEWELLINSULATION -6v MFG. CO., INCORPORATED,v CORPORATION OF VIRGINIA.

CONDENSER CEMEN'IED SECTIONAL INSULATOR.

Specification of Letters Patent. Patented Aug, 1922,

Application filed February 27, 1917". Serial No. 151,364.

To all whom t may concern.'

Be it known that I, SOL. S. SONNEBORN, a

of Brooklyn, county of Kings, and State of New York, have inventedcertain new, and useful Improvements in Condenser Cemented SectionalInsulators, set forth in the following specification.

This invention relates to sectional highpotential insulators of thetypeadapted to be mounted on a pin.

The object-of the invention is to increase the puncture strength of aplurality of nested insulating sections by distributing as uniformly aspossible the electro-static stress over the surfaces of the nestingportions. A furthermore specific object is to `accomplish thisldistribution of electro-static stress by employing a filling orcementing compound of such a character as to serve two purposes, that ofmechanically uniting the nesting parts and that of providing anelectrically conducting partition between the insulating partitions.Heretofore, on page 923 of Part I, volume 32 Iof the Transactions of theAmerican Institute of Electrical Engineers, a condenser type insulatorhas been described as built up of a series of substantially bell-shapedmetallic shells, spaced apart but'nesting and the spaces therebetweenlilled with a moulded dielectric compound. This theoretical suggestionis impracticable in the'construction of a commercial insulator and it iss ecifically an object of my invention to attain substantially the samebeneficial nesult in the way of stress distributionby employing standardvitrified porcelain sections but instead of cementing them together withan insulating cement, mechanically to unite them one to the other by ametallic filling -and either to extend the metallic filling as aconducting canopy over l cation in connection with the figures of theaccompanying drawing, which forms a part hereof and in which likecharacters desigexact number is immaterial.

nate corresponding parts in the figures, and

in which Fig. 1 is a vertical elevation partly citizen of the UnitedStates, and a resident in vertical section of one illustrativeembodiment of my invention; and. Fig. 2 is a fractional view in verticalsection illustrating one of the many possible modifications of myinvention. v

The insulator A is shown built up from a plurality of insulatingsections l, 2 and 3. So far as my invention is concerned, the

I have illustrated standard sections of a commercial type of pininsulator. The first or bottom section 3 comprises a cup-shaped portion4, suitably formed such as with threads to take the pin 5 andhaving-exterior corrugations 6. This insulating section 3 also comprisesa flaring petticoat 7. A second or. next outer section 2 comprises acup-shaped portion 8, adapted to nest over the cup-shaped portion A andhaving internal and external corrugations 9 and 10. The section 2 alsoycomprises a flaring petticoat 11. The outer section l comprises acup-shaped portion 12 and a flaring petticoat 13, the cup-shaped portionhaving internal corrugations 14 and a seat 15 for supporting aconductor. It is to be understood that the corrugations formed on theadjacent 'surfaces of the cupshaped sections need not, of necessity, becorrugations, as any provision tending to lock the lparts togetherthrough the medium of filling is contemplated.

The filling, which has heretofore lbeen a highly insulating' cement, inthe case of my invention, as illustrated by the fillings 16 and 17, ismetallic. It may be formed in any suitable manner such as by pouringmolten lead ora conducting alloy into the spaces between two nestedportions, the same S25 being inverted during the process; or the fillingmay be formed from a suitable metallic amalgam such as a zinc mercuryamalgam or the filling may be formed out of av plastic metallic cement,the principal base of which is a ulverized or granulated metal.

' Be ore the assembling ofthe various secy tions going to make up theinsulator, sheet metal sheaths such as 18 and 19, preferably formed ltoconform to the surfaces of the petticoats for which they `are designed,may be applied lto the petticoats, as for example, lto the petticoats 7and 11 respectively. When the metallic fillings 16 and 17 are. formedthe filling may have a portion such as the portion 20 for the filling 16and the portion 21 for ,the filling 17, which is caused electrically andmechanically to unite with the respective metallic sheaths 18 and 19. Ifdesired, the portionsQO and 21 may be solder. In otherwords,"the sheaths18 and 19 may -be soldered directly to the metallic filling, in whichcase a chemical union in addition to an electrical and mechanical one ismade. It is also comprehended that, if the sheets are made of zinc, itis possible to make achemical union between the cement and the vzincamalgam filling.

In Fig. 2 I have shown a modification in which the filling 170 isitselfl continued and flared into the sheath 190 about the surface ofthe petticoat 7.

What I claim and what I desire to secure by United States Letters Patentis:

1. A high-potential insulator of the condenser type comprising aplurality of insulating sections, each section comprising a cup-shapedportion, the cup-shaped portions being nested one within the other; oneor more of the inner sections having a petticoat; a metallic fillingcovering the entire surface of a nested cup-shaped portion of asectionand mechanically uniting it with the next outer cup-shapedportion; and a metallic sheath covering the petticoat portion'of saidvsection and in electrical connection with said metallic filling.

2. A high-potential insulator of the condenser type comprising aplurality of insulating portions in the forni of solids of revolutionhaving each a cap-part and at least one a petticoat-part also, thecap-parts

